Shimano BT-DN300 Built-In DI2 Battery – For Dura-Ace 9250 Ultegra R8150 Systems Compatible SD300 Wires

Shimano BT-DN300 Built-In DI2 Battery – For Dura-Ace 9250 and Ultegra R8150 Systems Compatible with SD300 Wires. Shimano Di2 Batteries. Must purchase battery charger and power cable to complete the system.

• All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions
• Use Di2 system checker to update component firmware from http://e-tubeproject.shimano.com/